<template>
  <div>
    <div class="search">
      <input class="search-input" type="text" v-model="keyword" placeholder="请输入城市名或拼音"/>
    </div>
    <div class="search-content" ref="wrapper" v-show="keyword">
      <!-- 搜索框没有字符时不显示 -->
      <ul>
        <li class="search-item border-bottom"
          v-for="item of list"
          :key="item.id"
          @click="handleCityClick(item.name)"
        >
          {{item.name}}
        </li>
        <li class="search-item border-bottom" v-show="hasNoData">没有找到匹配数据</li>
        <!-- 当list中匹配到的数据个数为0时，显示 -->
      </ul>
    </div>
  </div>
</template>

<script>
import BScroll from 'better-scroll'
import {mapMutations} from 'vuex'
export default {
  name: 'CitySearch',
  props: {
    cities: Object
  },
  data () {
    return {
      keyword: '',
      timer: null,
      list: []
    }
  },
  mounted () {
    this.scroll = new BScroll(this.$refs.wrapper)
    // 使用Bscroll实现滚动效果
  },
  computed: {
    hasNoData () {
      return !this.list.length
    }
  },
  watch: {
    keyword () {
      if (this.keyword) {
        if (this.timer) {
          clearTimeout(this.timer)
        }
        const searchList = []
        setTimeout(() => {
          for (let i in this.cities) {
            this.cities[i].forEach((value) => {
              if (value.spell.indexOf(this.keyword) > -1 || value.name.indexOf(this.keyword) > -1) {
                // 如果在cities里检索到了包含keyword(未检索到indexOf返回-1)的数据
                // 将该数据压入searchList数组
                searchList.push(value)
              }
            })
          }
          this.list = searchList
        }, 100)
      } else {
        this.list = []
        // 若input框没有字符，将list置空
      }
    }
  },
  methods: {
    handleCityClick (city) {
      this.changeCity(city)
      this.$router.push('/')
      // 通过js编程式路由，点击后跳回首页
      // <router-link :to="...">这是声明式
    },
    ...mapMutations(['changeCity'])
  }
}
</script>

<style lang="stylus" scoped>
  @import '~styles/varibles.styl'
  .search
    height: .72rem
    padding: 0 .1rem
    background: $bgColor
    .search-input
      box-sizing: border-box
      width: 100%
      height: .62rem
      padding: 0 .1rem
      line-height: .62rem
      text-align: center
      border-radius: .1rem
      color: #666
  .search-content
    z-index: 1
    overflow: hidden
    position: absolute
    top: 1.58rem
    left: 0
    right: 0
    bottom: 0
    background: #eee
    .search-item
      line-height: .62rem
      padding-left: .2rem
      background: #fff
      color: #666
</style>
